Great you are seeing improvements with the work you are doing.
You have identified areas that need work which is good. Direction to your work.
Doesn’t sound like these are new issues so will take diligent consistent work and looking at movement patterns to get to why the hip flexors and adductors are remaining tight.
Improvements in the couch series is solid. Systems of systems as one thing improves you can see improvements in others. Working up and down stream of where you see the problem. Where you see it isn’t always where it originates.
As your t spine situation improved you identified other things that need attention. How things work.
Keep working with things and it is great to hear things are improving.
Questions on anything shoot me a message.